Improved adding identifiers, classifiers, and contacts
Improved adding identifiers, classifiers, and contacts

Put in appropriate place if element doesn;t already exist

git-svn-id: 43ce4a4b5c3e98f7c475606770a3f17db2f2dd99@57 fe31d19f-0751-0410-af65-b179d9baafec

sensiasoft/lib-sensorml